L971 Series

The Murphy L971 Series Level Switch detects low oil level in a compressor’s crankcase.

As oil level in the crankcase depletes, the float on the L971 switch falls, and when reaching the predetermined limit, it will trip the internal snap-switch sounding an alarm or initiating shutdown. The L971 is designed for Ingersoll-Rand Type 30, Type 40 and ESH compressors, yet it can be adapted to fit other compressors that have an inspection plate extending below normal operating oil level. It installs with minimal downtime and has a two-year limited warranty. The L971 has a 1/2 NPT process connection and features an explosion-proof enclosure, durable SPDT snap-switch and rigid polyurethane foam float. A 304 stainless steel float is available on certain configurations.

L971 SERIES
  • CE
  • cCSAus
  • Underwriters Laboratories
Specifications Downloads How To Order
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  • Operating Temperature Range: -15 to 275°F (-26 to 135°C)
  • Maximum Working Pressure: 30 psi (206 kPa) [2.06 bar]
  • Switch Rating: 4 A @ 250 VAC
  • Case: Aluminum (explosion-proof)
  • Mounting Adaptor: Brass
  • Floats: Rigid polyurethane. 304 stainless steel available on L971-C only
  • Other Wetted Parts: 303, 304, and 316 stainless steel
  • O-Ring Seals: Viton and Buna
  • Process Connection: 1/2 NPT
  • Hazardous Location Rating: UL and CSA listed for Class I, Groups C & D; Class II, Groups F & G.
  • Enclosure Type / Ingress Protection Rating:  IP66 per IEC 60529.
  • Conduit Connection: 1/2 NPT
  • Wire: 18 AWG (0.75 mm2)
  • Shipping Weight: 1 lb. 10 oz. (0.7 kg)
  • Shipping Dimensions: 8-1/4 x 4-1/4 x 4-1/2 in. (210 x 108 x 114 mm)

 WARNING: This product may expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information about California Propsition 65, go to www.P65Warnings.ca.gov or visit our California Proposition 65 page.

Additional product documentation can be found on our product support website or by clicking the Help Center button above.

Options are ordered by Case/Float Configurations. Please reference the Case/Float Configuration Diagram and the Dimensions for each model. All configurations may not be available. Call your sales representative or Enovation Controls for more information.

  • L971–  A  
    • Blank = Standard Configuration
    • A = Configuration A
    • B = Configuration B
    • C = Configuration C
    • D = Configuration D
    • E = Configuration E
    • F = Configuration F
    • G = Configuration G
  • 15000449 – Float Kit for L971

Dimensions

Dimensions are inches (millimeters).

Model A B C D E
L971 2-5/8 (67) 5-7/8 (149) 30 (762) 2-1/2 (64) 2-27/32 (72)
L971-A 2-5/8 (67) 5-7/8 (149) 30 (762) 2-1/2 (64) 2-27/32 (72)
L971-B 4-13/16 (122) 8-1/16 (205) 30 (762) 4-5/8 (117) 2-27/32 (72)
L971-C 2-13/16 (71) 6-1/16 (154) 30 (762) 2-7/8 (73) 3-1/8 (79)
L971-D 3-7/8 (98) 7-1/8 (181) 30 (762) 3-3/4 (95) 2-27/32 (72)
L971-E 4-13/16 (122) 8-1/16 (205) 30 (762) 5-1/8 (130) 2-27/32 (72)
L971-F 2-5/8 (67) 5-7/8 (149) 49 (1016) 2-1/2 (64) 2-27/32 (72)
L971-G 2-5/8 (67) 5-7/8 (149) 40 (1016) 2-1/2 (64) 2-27/32 (72)

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